Dep helper (#2151)

* Add dep task to update go dependencies

* Update go dependencies

vendor/github.com/modern-go/concurrent/map_test.go

@@ -1,18 +0,0 @@
-package concurrent_test
-
-import (
-	"github.com/modern-go/concurrent"
-	"testing"
-)
-
-func TestMap_Load(t *testing.T) {
-	m := concurrent.NewMap()
-	m.Store("hello", "world")
-	value, found := m.Load("hello")
-	if !found {
-		t.Fail()
-	}
-	if value != "world" {
-		t.Fail()
-	}
-}

vendor/github.com/modern-go/concurrent/unbounded_executor_test.go

@@ -1,54 +0,0 @@
-package concurrent_test
-
-import (
-	"context"
-	"fmt"
-	"time"
-	"github.com/modern-go/concurrent"
-)
-
-func ExampleUnboundedExecutor_Go() {
-	executor := concurrent.NewUnboundedExecutor()
-	executor.Go(func(ctx context.Context) {
-		fmt.Println("abc")
-	})
-	time.Sleep(time.Second)
-	// output: abc
-}
-
-func ExampleUnboundedExecutor_StopAndWaitForever() {
-	executor := concurrent.NewUnboundedExecutor()
-	executor.Go(func(ctx context.Context) {
-		everyMillisecond := time.NewTicker(time.Millisecond)
-		for {
-			select {
-			case <-ctx.Done():
-				fmt.Println("goroutine exited")
-				return
-			case <-everyMillisecond.C:
-				// do something
-			}
-		}
-	})
-	time.Sleep(time.Second)
-	executor.StopAndWaitForever()
-	fmt.Println("executor stopped")
-	// output:
-	// goroutine exited
-	// executor stopped
-}
-
-func ExampleUnboundedExecutor_Go_panic() {
-	concurrent.HandlePanic = func(recovered interface{}, funcName string) {
-		fmt.Println(funcName)
-	}
-	executor := concurrent.NewUnboundedExecutor()
-	executor.Go(willPanic)
-	time.Sleep(time.Second)
-	// output:
-	// github.com/modern-go/concurrent_test.willPanic
-}
-
-func willPanic(ctx context.Context) {
-	panic("!!!")
-}